Modified an existing dialog box by adding more fields, changing contents of a group list, etc.
At runtime (ASP.Net C# application) , the following error is displayed on the browser instead of displaying the dialog box.
Height must be non negative.
Parameter name: value
Description: An unhandled exeception occurred during the execution of the currrent web request.
Exception Details: System.ArgumentOutOfRangeException: Height must be non negative.
Release : 8.6
One of the newly added 2 group lists (the simplest of the two, with just one field) was causing the problem. Delete it from the screen and add it again and now the screen is being displayed.